DH and I just went to ours last night and it was extremely informative and even exciting. My only regret is not doing this a bit sooner! We're giving birth at a hospital that happens to also have a birth center. Only certain OBs and midwives offer services at the birth center. Unfortunately, the birth center is not an option for us bc our OB only delivers at the L&D rooms but I'm ok with this bc he does support natural childbirths. Still, it would have been nice to deliver at the birth center.
So I recommend to all you ladies, regardless of how early you are in your pregnancy to start checking out the free hospital tours available to you. It will also get your DH involved as you prepare for the big day : )